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pineappleEA
2020-12-28 15:15:37 +00:00
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commit 78b48028e1
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externals/libressl/crypto/bio/bss_mem.c vendored Executable file
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/* $OpenBSD: bss_mem.c,v 1.17 2018/05/12 18:51:59 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/buffer.h>
static int mem_write(BIO *h, const char *buf, int num);
static int mem_read(BIO *h, char *buf, int size);
static int mem_puts(BIO *h, const char *str);
static int mem_gets(BIO *h, char *str, int size);
static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int mem_new(BIO *h);
static int mem_free(BIO *data);
static const BIO_METHOD mem_method = {
.type = BIO_TYPE_MEM,
.name = "memory buffer",
.bwrite = mem_write,
.bread = mem_read,
.bputs = mem_puts,
.bgets = mem_gets,
.ctrl = mem_ctrl,
.create = mem_new,
.destroy = mem_free
};
/* bio->num is used to hold the value to return on 'empty', if it is
* 0, should_retry is not set */
const BIO_METHOD *
BIO_s_mem(void)
{
return (&mem_method);
}
BIO *
BIO_new_mem_buf(const void *buf, int len)
{
BIO *ret;
BUF_MEM *b;
size_t sz;
if (!buf) {
BIOerror(BIO_R_NULL_PARAMETER);
return NULL;
}
sz = (len < 0) ? strlen(buf) : (size_t)len;
if (!(ret = BIO_new(BIO_s_mem())))
return NULL;
b = (BUF_MEM *)ret->ptr;
b->data = (void *)buf; /* Trust in the BIO_FLAGS_MEM_RDONLY flag. */
b->length = sz;
b->max = sz;
ret->flags |= BIO_FLAGS_MEM_RDONLY;
/* Since this is static data retrying wont help */
ret->num = 0;
return ret;
}
static int
mem_new(BIO *bi)
{
BUF_MEM *b;
if ((b = BUF_MEM_new()) == NULL)
return (0);
bi->shutdown = 1;
bi->init = 1;
bi->num = -1;
bi->ptr = (char *)b;
return (1);
}
static int
mem_free(BIO *a)
{
if (a == NULL)
return (0);
if (a->shutdown) {
if ((a->init) && (a->ptr != NULL)) {
BUF_MEM *b;
b = (BUF_MEM *)a->ptr;
if (a->flags & BIO_FLAGS_MEM_RDONLY)
b->data = NULL;
BUF_MEM_free(b);
a->ptr = NULL;
}
}
return (1);
}
static int
mem_read(BIO *b, char *out, int outl)
{
int ret = -1;
BUF_MEM *bm;
bm = (BUF_MEM *)b->ptr;
BIO_clear_retry_flags(b);
ret = (outl >=0 && (size_t)outl > bm->length) ? (int)bm->length : outl;
if ((out != NULL) && (ret > 0)) {
memcpy(out, bm->data, ret);
bm->length -= ret;
if (b->flags & BIO_FLAGS_MEM_RDONLY)
bm->data += ret;
else {
memmove(&(bm->data[0]), &(bm->data[ret]), bm->length);
}
} else if (bm->length == 0) {
ret = b->num;
if (ret != 0)
BIO_set_retry_read(b);
}
return (ret);
}
static int
mem_write(BIO *b, const char *in, int inl)
{
int ret = -1;
int blen;
BUF_MEM *bm;
bm = (BUF_MEM *)b->ptr;
if (in == NULL) {
BIOerror(BIO_R_NULL_PARAMETER);
goto end;
}
if (b->flags & BIO_FLAGS_MEM_RDONLY) {
BIOerror(BIO_R_WRITE_TO_READ_ONLY_BIO);
goto end;
}
BIO_clear_retry_flags(b);
blen = bm->length;
if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl))
goto end;
memcpy(&(bm->data[blen]), in, inl);
ret = inl;
end:
return (ret);
}
static long
mem_ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret = 1;
char **pptr;
BUF_MEM *bm = (BUF_MEM *)b->ptr;
switch (cmd) {
case BIO_CTRL_RESET:
if (bm->data != NULL) {
/* For read only case reset to the start again */
if (b->flags & BIO_FLAGS_MEM_RDONLY) {
bm->data -= bm->max - bm->length;
bm->length = bm->max;
} else {
memset(bm->data, 0, bm->max);
bm->length = 0;
}
}
break;
case BIO_CTRL_EOF:
ret = (long)(bm->length == 0);
break;
case BIO_C_SET_BUF_MEM_EOF_RETURN:
b->num = (int)num;
break;
case BIO_CTRL_INFO:
ret = (long)bm->length;
if (ptr != NULL) {
pptr = (char **)ptr;
*pptr = (char *)&(bm->data[0]);
}
break;
case BIO_C_SET_BUF_MEM:
mem_free(b);
b->shutdown = (int)num;
b->ptr = ptr;
break;
case BIO_C_GET_BUF_MEM_PTR:
if (ptr != NULL) {
pptr = (char **)ptr;
*pptr = (char *)bm;
}
break;
case BIO_CTRL_GET_CLOSE:
ret = (long)b->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
b->shutdown = (int)num;
break;
case BIO_CTRL_WPENDING:
ret = 0L;
break;
case BIO_CTRL_PENDING:
ret = (long)bm->length;
break;
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
ret = 1;
break;
case BIO_CTRL_PUSH:
case BIO_CTRL_POP:
default:
ret = 0;
break;
}
return (ret);
}
static int
mem_gets(BIO *bp, char *buf, int size)
{
int i, j;
int ret = -1;
char *p;
BUF_MEM *bm = (BUF_MEM *)bp->ptr;
BIO_clear_retry_flags(bp);
j = bm->length;
if ((size - 1) < j)
j = size - 1;
if (j <= 0) {
*buf = '\0';
return 0;
}
p = bm->data;
for (i = 0; i < j; i++) {
if (p[i] == '\n') {
i++;
break;
}
}
/*
* i is now the max num of bytes to copy, either j or up to
* and including the first newline
*/
i = mem_read(bp, buf, i);
if (i > 0)
buf[i] = '\0';
ret = i;
return (ret);
}
static int
mem_puts(BIO *bp, const char *str)
{
int n, ret;
n = strlen(str);
ret = mem_write(bp, str, n);
/* memory semantics is that it will always work */
return (ret);
}